Boletus POLYPORACE^E 319 



Subgenus 3. Boletinus. Trama descending somewhat between the 

 tubes, the hymenophore is therefore not smooth after their 

 removal ; in this respect Boletinus resembles Strobilomyces. 

 The relationship between Boletus and Boletinus is similar to 

 that between Polyporus and Trametes. 1515a 



Subgenus i. Euboletus. 

 (From being typical examples of the genus ; Gr. eu, well.) 



EUCHRO/E. 



a. Viscipelles. 



1456. B. luteus L. (from the yellow tubes ; luteus, yellow) a b c. 



P. gibbous, pulvinate to convex, deep vinous brown, covered 

 with dark purplish gluten which is at first continuous over the 

 tubes, forming a V. St. equal, dull light yellowish. A. large, 

 membranous, white to dark purplish. T. yellow or brownish- 

 yellow. Po. minute. 



Edible. Woods, pine ; common. July-Nov. 5 x 2§ x £ in. 



1457. B. elegans Schum. (from its elegance) a b c. 



P. convex, dark rich yellow, shaded orange. St. sulphur to 

 orange above A., darker below. A. broad, fugacious, sulphur. 

 T. decurrent, sulphur to bright yellow. Po. minute. 



Woods, chiefly larch, oak, pine ; common. June-Oct. 4l X 2§ x | in. 



1458. B. flavus With, (from the yellow pileus ; flavus, light yellow) 



a b c. 



P. convex or pulvinate, full luminous yellow, covered when 

 young with claret-brown gluten. St. equal, reticulate, yellow 

 above, brownish-yellow below. A. membranous, fugacious, 

 white to yellow-white. T. adnate, bright yellow or brownish- 

 yellow. Po. larger than in 1456 and 1457. 



Woods, mixed ; common. Aug. -Nov. 4^ x 3 J X £ in. 



1459. B. flavidus Fr. (from the yellowish pileus ; flavidus, light 



yellowish) a b c. 



P. convex, obtuse, brownish-yellow or pale yellowish-burl. 

 St. equal, whitish-yellow or straw-colour, granular above the 

 brownish viscid A. T. adnate to slightly decurrent, yellow, 

 somewhat sulphur. Po. angular. Flesh pale ochre. 



Woods, pine. July-Oct. 2^ x i\ x \ in. 



1460. B. eollinitus Fr. (from the gluten-besmeared pileus ; collino, to 



besmear) a b c. 



P. pulvinate to expanded and slightly depressed, brownish-buff, 



sometimes pale, covered with rich vinous-brown gluten. 



St. attenuate downwards, rooting, white, becoming brownish. 



T. adnate to subdecurrent, pallid to yellow. Flesh white. 



Solitary. Edible. Woods, fir. Nov. 32 x ih X \\ in. When young 

 resembles 1456. 



